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39.  Astronomers have discovered a planetary system orbiting the
star Upsilon Andromedae, which is at a distance of
4.2 x 1017
m from the earth. One planet is believed to be
located at a distance of 1.2 x
1011 m from the star. Using visible light with a
vacuum wavelength of 550 nm, what is the minimum necessary aperture diameter
that a telescope must have so that it can resolve the planet and the star?
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